Owing to sands allusion

a certain area of new-formed land annually occurred in Yellow river delta(YRD) region.These lands were characterized with rich nutrients

hence usually were exploited as farmlands.However soil salinisation frequently came forth due to drought and high evaporation when these lands were cultivated.Thereby there were various land use systems in YRD area.In order to approach land degradation mechanism

5 typical land use patterns were chosen

soil samples were specifically collected and soil chemical properties were analyzed

soil enzymes(Invertase

Phosphatases

Catalases) activity as well.The results indicated that soil salinity was lowest

nutrition was best

and soil enzymes activity was highest for arable land.For grassland

soil quality became a little bad

as these lands came from degraded farmlands.For shrub land

soil conditions got much more badly

as these shrubs grew in salinized land.In forested lands including pure stands and mixed forests

soil nutrition and enzymes activity were better

salts concentration also was lower

which implied that trees could ameliorate soil conditions to some extent.Among the five land use types

no doubt

soil quality was worst in wild lands.